login: panic: thread 0xfffff800905f5f80 cpu2 is not within netisr_ncpus 6
cpuid = 2
Trace beginning at frame 0xfffff80117b53740
ip_output() at ip_output+0x64e 0xffffffff807b387e 
ip_output() at ip_output+0x64e 0xffffffff807b387e 
pf_send_tcp() at pf_send_tcp+0x4f3 0xffffffff8260bca3 
pf_unlink_state() at pf_unlink_state+0xc6 0xffffffff8260bde6 
pf_purge_expired_states() at pf_purge_expired_states+0x89 0xffffffff8260be79 
pf_purge_thread() at pf_purge_thread+0xb4 0xffffffff8260bfc4 
Debugger("panic")

CPU2 stopping CPUs: 0x0000003b
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>